| Patents for H01H 47 - Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current (7,312) |
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| 03/02/1991 | WO1991003741A1 System for detecting melt-adhesion of relay |
| 03/02/1991 | CA2039163A1 Fusion detecting system for relays |
| 02/28/1991 | DE4026398A1 Power transistor switch status monitoring circuit |
| 02/28/1991 | DE3927972A1 Stable PWM control of hydraulic valve - uses FETs as switches to reduce switching delay and increase power efficiency |
| 02/27/1991 | EP0414069A2 Electromagnetic switching device connectable to an alternating current line |
| 02/27/1991 | EP0413938A1 Circuit for monitoring the switching state of a power transistor |
| 02/21/1991 | DE3926990A1 Mains supply with battery back-up - switched in by relay stages to maintain continuity esp. in hospital |
| 02/12/1991 | US4992777 Switch device with a trouble detecting and indicating function |
| 02/06/1991 | EP0411903A2 Arrangement of automatically restoring normal operation of latch-in relay |
| 02/06/1991 | CN1049068A Noiseless running and energy saving device for ac contactor |
| 02/05/1991 | US4991054 Time-delay outdoor lighting control systems |
| 01/30/1991 | EP0395741A4 Driver circuit for solenoid operated fuel injectors |
| 01/29/1991 | US4989116 Chopper circuit for driving electromagnet and/or step motor coils such as employed in a matrix printer |
| 01/23/1991 | EP0261134B1 Process for controlling the excitation time of electromagnetic systems, in particular electromagnetic valves in internal combustion engines |
| 01/22/1991 | US4987513 Apparatus and method for selectively delaying the connection of an electrical supply voltage to an electrical load |
| 01/22/1991 | US4987512 Solid state circuit protector |
| 01/10/1991 | WO1991000634A1 Remote sensing power disconnect circuit |
| 12/27/1990 | EP0238509B1 Solenoid driver control unit |
| 12/25/1990 | US4980801 Protection module for a contact-maker electromagnet |
| 12/19/1990 | EP0403216A2 Electromagnetic actuator arrangement |
| 12/19/1990 | EP0402455A1 Digitally controlled contactor and method for controlling a contactor |
| 12/19/1990 | EP0402359A1 Circuit arrangement for cyclic supply. |
| 12/19/1990 | CN2067860U Power-saving apparatus for refrigerator |
| 12/18/1990 | US4978865 Circuit for regulating a pulsating current |
| 12/14/1990 | CA2018965A1 Electromagnetic actuator arrangement |
| 12/12/1990 | CN2067455U Ac magnet running device |
| 12/11/1990 | US4977478 Contact status detector |
| 12/11/1990 | US4977332 Power switching apparatus |
| 12/06/1990 | DE3917806A1 Limiting control of actuator - is provided by comparison process to identify when limit is reached |
| 12/05/1990 | EP0400389A2 Solenoid closure detection |
| 12/05/1990 | CN1047587A Alternating-current contactor energy-saving damping circuit |
| 11/28/1990 | EP0399983A2 Emergency shutdown for industrial installation |
| 11/28/1990 | EP0229761B1 Fuel injection solenoid driver circuit |
| 11/28/1990 | EP0070873B1 Driver circuit for use with inductive loads or the like |
| 11/20/1990 | US4972133 Fail-safe means for electrical power steering |
| 11/20/1990 | CA1276679C Control of the energization of an electromagnet |
| 11/13/1990 | US4970623 Peripheral device power activation circuit and method therefor |
| 11/13/1990 | US4970622 Method and apparatus for controlling the operation of an electromagnet |
| 11/07/1990 | EP0395741A1 Driver circuit for solenoid operated fuel injectors. |
| 10/31/1990 | CN2064937U Capacitive noiseless electricity-saving device |
| 10/30/1990 | US4967309 Dual current sensing driver circuit |
| 10/24/1990 | EP0393847A1 Method and apparatus for inductive load control with current simulation |
| 10/17/1990 | EP0392058A1 Circuit arrangement for drive of at least one electromagnetic relay |
| 10/17/1990 | CN2064098U Electricity-saving coil of a.c. contactor |
| 10/17/1990 | CA2010794A1 Method and apparatus for inductive load control with current simulation |
| 10/11/1990 | DE3911431A1 Integratable free-wheeling circuit |
| 10/11/1990 | DE3910810A1 Circuit arrangement for a solenoid (electromagnetic) valve |
| 10/10/1990 | CN2063687U Protective winding for ac contactor |
| 10/02/1990 | US4961006 Inductively loaded switching transistor circuit |
| 10/02/1990 | CA1274872A1 Circuit breaker with self-contained electronic trip actuator |
| 09/27/1990 | DE3909613A1 Circuit arrangement for self-monitoring of a switching device for a load circuit |
| 09/26/1990 | CN2062901U Energy saver for ac contactor |
| 09/26/1990 | CN2062900U High-efficient energy saving controller for electromagnetic switch |
| 09/20/1990 | WO1990010967A1 Solid state circuit protector |
| 09/19/1990 | EP0387730A2 Electronic contactor with emergency shut-down |
| 09/19/1990 | EP0387729A2 Electronic control for contactor |
| 09/19/1990 | CN2062493U 一种电磁继电器 An electromagnetic relay |
| 09/13/1990 | DE3907880A1 Circuit arrangement for outputting binary signals |
| 09/13/1990 | DE3744873C2 Fail-safe error-protected load circuit |
| 09/12/1990 | EP0386300A1 Integrable circuit for energising a direct current relay |
| 09/12/1990 | CN2062115U Integral soundless energy-saving contactor |
| 09/07/1990 | WO1990010332A1 Fail-safe and fault-tolerant alternating current output circuit |
| 09/05/1990 | EP0384926A1 Circuit arrangement for energising and de-energising a bistable relay |
| 08/29/1990 | CN2061341U Ac voltage-stabilizing time-delay protector |
| 08/29/1990 | CN2061332U No-voltage operating alternating-current contactor |
| 08/29/1990 | CN2061331U A.c. contactor electricity-saving device |
| 08/28/1990 | USRE33314 Vending machine power switching apparatus |
| 08/28/1990 | US4951468 Method of determining duty ratio used for operational control of a solenoid |
| 08/27/1990 | CA2011007A1 Fail-safe and fault-tolerant alternating current output circuit |
| 08/23/1990 | WO1990009518A1 Circuit arrangement and process for accelerated switching of electromagnetic consumers |
| 08/23/1990 | DE4004400A1 Circuit for monitoring function of glow plugs of diesel engine - uses auxiliary evaluation circuit-monitor plugs concerning short circuit and min. current |
| 08/23/1990 | DE3904605A1 Schaltungsanordnung und verfahren fuer das beschleunigte schalten von elektromagnetischen verbrauchern Circuit arrangement and method for the accelerated shift of electromagnetic sumers |
| 08/23/1990 | DE3904441A1 Chopper circuit for driving the coils of electromagnets and/or stepper motors, especially for a matrix printer |
| 08/14/1990 | US4949215 Driver for high speed solenoid actuator |
| 08/08/1990 | CN2060257U Transformer type no-sound electricity-saving unit |
| 08/07/1990 | US4947283 Solenoid drive circuit |
| 08/07/1990 | US4947278 Remote sensing power disconnect circuit |
| 08/01/1990 | EP0380089A2 A relay driving circuit for a latching relay |
| 08/01/1990 | CN2060019U Power saving protecting controller for refrigerator |
| 07/31/1990 | US4945256 Device for producing even closing of a circuit breaker |
| 07/25/1990 | CN2059765U Antishock thermal relay |
| 07/24/1990 | US4943715 Limit switch having means to evaluate its actuating stroke |
| 07/12/1990 | WO1990007787A1 Digitally controlled contactor and method for controlling a contactor |
| 07/12/1990 | WO1990006237A3 Method and apparatus for driving and controlling an improved solenoid impact imprinter |
| 07/04/1990 | EP0376495A2 Peripheral device power activation circuit and method therefor |
| 07/04/1990 | EP0376493A1 Control circuit |
| 07/04/1990 | EP0343161A4 Solenoid driver control circuit with initial boost voltage. |
| 07/03/1990 | US4939438 Relay control assembly |
| 06/28/1990 | DE3843277A1 Power output stage for electromagnetic loads |
| 06/21/1990 | DE3841875A1 Electrical device for switching electrical loads |
| 06/20/1990 | CN2058530U Electricity-saving device for silently running ac & dc dual-purpose contactor |
| 06/14/1990 | WO1990006237A2 Method and apparatus for driving and controlling an improved solenoid impact imprinter |
| 06/13/1990 | EP0372442A2 Switching device |
| 06/13/1990 | CN2058272U Power witch being able to regulating voltage timely |
| 06/13/1990 | CN2058271U Noise eliminating and power saving silicon controlled push-button |
| 06/07/1990 | DE3840991A1 Drive circuit for electromagnetic switchgear |
| 06/05/1990 | CA1270068A1 Adaptable selection and profiling of coil currents for multiple actuator assembly |
| 05/30/1990 | CN2057778U Weak current-controlling remanence contactor |
| 05/30/1990 | CN2057777U Time-delay/timing type remanence contactor |
| 05/29/1990 | US4930040 Current regulator for inductive loads |